dobavyane na ychenici cyala zadacha

using System;
using System.Linq;
using System.Collections.Generic;
public class Program
{
    public static void Main()
    {
		Dictionary<string, List<string>> school = new Dictionary<string, List<string>> ();
		while(true)
		{
			string[] command = Console.ReadLine().Split(' ');
			if (command[0] == "End")
			{
				break;
			}
			else if (command[0] == "Add")
			{
				string student = command[1];
				string paralelka = command[2];
				if(school.ContainsKey(paralelka))
				{
					school[paralelka].Add(student);
				}
				else
				{
					List<string> newParalelka = new List<string>();
					newParalelka.Add(student);
					school[paralelka] = newParalelka;
				}
			}

			else if(command[0] == "Transfer")
			{
				string student = command[1];
				string par1 = command[3];
				string par2 = command[5];
				if(school[par1].Contains(student))
				{
					school[par1].Remove(student);
					if(school[par1].Count == 0)
					{
						school.Remove(par1);
					}
					if(school.ContainsKey(par2))
					{
						school[par2].Add(student);
					}
					else
					{
						school[par2] = new List<string>();
						school[par2].Add(student);
					}
				}
			}
			else if(command[0] == "Merge")
			{
				string par1 = command[1];
				string par2 = command[2];
				if(school.ContainsKey(par1) && school.ContainsKey(par2))
				{
					foreach(string student in school[par1])
					{
						school[par2].Add(student);
					}
					school.Remove(par1);
				}
			}
		}
		foreach(string paralelka in school.Keys)
		{
			Console.WriteLine("Class name: " + paralelka);
			foreach(string student in school[paralelka])
			{
				Console.WriteLine("###" + student);
			}
		}
	}
}